Unbeilevably Huge Light Leak on OpenMV Cam

Discussion related to "under the hood" OpenMV topics.
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Joined: Thu Jul 12, 2018 1:54 pm

Unbeilevably Huge Light Leak on OpenMV Cam

Postby DROBNJAK » Sat Jul 14, 2018 7:47 am

I was getting this blue ghosting in both bottom corners of the videos. I thought it was just a smudge on the sensor, or IR filter.

But I was wrong. When I put Cam directly under my table lamp, with lens cover on, blue ghost patches were still there in a full strength. I thought light was leaking through a gap between the board and lens holder. But it wasn't. When I covered the gap, ghost patches were still there. Check the pic bellow.
P1020339_640x480.jpg (111.38 KiB) Viewed 539 times
Than I eventually covered both the gap and the whole back of the sensor with a black insulation tape, and ghosting patch completely disappeared:
P1020342_640x480.jpg (87.94 KiB) Viewed 539 times
For the best results one needs to cover both the back of the sensor and the gap between lens housing and the board, like this:
P1020345_640x480.jpg (68.53 KiB) Viewed 539 times
But as sensor gets hot, during the use, I doubt that insulation tape's glue will hold for very long. Any other ideas?
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Re: Unbeilevably Huge Light Leak on OpenMV Cam

Postby kwagyeman » Sat Jul 14, 2018 3:04 pm

Hi, the camera should have come with a sticker on the back of it. However, there was a manufacturing issue with a previous batch where some cams go out without the tape on them. Anyway, black electrical tape fixes the issue... or a black sticker on the back off the camera. The tap should not come off with the heat produced by the sensor.

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